is on the low side for all your animals and may be what's ticking the xenia off, I would recommend upping it to 1.025.
, your lighting is just this side of adequate for soft corals and shrooms
, most xenia thrive in very intense light, IMO
is OK, but the xenia might respond better if it was upped to about 8.3-8.4, although i suspect the ph
will climb a hair if you up the SG
Camel shrimp are not considered reef safe and may very well be snacking on your xenia as well as other stuff.
And it is never good to have a critter in your tank that you do not know what it is, sometimes it is unavoidable...but you should never add one on purpose, I am assuming this was a hichiker on your live rock.